"We"re approaching deep water," was the answer. "I"m going to submerge."
A little later, by means of her diving rudders, aided also by the tanks, the M. N. 1 began to sink. Down, down, down she went.
"Now I"ll be able to show you some pretty sights, Mr. Hardley," said Tom, as he and his friends entered the forward compartment, while the steel shutters were rolled back from the heavy gla.s.s windows. "We"ll be in deep waters presently."
Ten minutes later the depth gauge showed that they were down about three hundred feet, and that is pretty deep for a submarine. But Tom"s boat was capable of even greater depths than that.
At first there was nothing much to observe save the opal-tinted water illuminated by the powerful lights of the submarine. Small, and evidently frightened, fish darted to and fro, but there was nothing especially to attract the attention of Tom and his friends, who had made much more sensational trips than this under water.
Mr. Hardley, however, was fascinated, and kept close to the observation windows.
"Are there any wrecks around here?" he asked Tom.
"Possibly," was the answer. "Though they do not contain any treasure, I imagine--brick schooners or cargo boats would be about all."
The submarine went deeper, plowing her way through the Atlantic at a depth of more than three hundred and fifty feet, for Tom wanted to subject her to a good test.
Suddenly Mr. Hardley, who was now alone at the window on the port side, uttered a cry of alarm.
"Look! Look!" he fairly shouted. "We"re surrounded by a school of sharks! What monsters! Are we in danger?"
CHAPTER XIII
THE SEA MONSTER
Tom Swift, who had been making readings of the various gauges, taking notes for future use, and otherwise busying himself about the navigation of his reconstructed craft, turned quickly from the instrument board at the cry from Mr. Hardley. The gold-seeker, with a look of terror on his face, had recoiled from the observation windows.
"Bless my hat band!" cried Mr. Damon. "Look, Tom!"
They all turned their attention to the gla.s.s, and through the plates could be seen a school of giant fishes that seemed to be swimming in front of the submarine, keeping pace with it as though waiting for a chance to enter.
"Are we well protected against sharks, Mr. Swift?" demanded the adventurer. "Are these sea monsters likely to break the gla.s.s and get in at us?"
"Indeed not!" laughed Tom. "There is absolutely no danger from these fish--they aren"t sharks, either."
"Not sharks?" cried Mr. Hardley. "What are they, then?"
"Horse mackerel," Tom answered. "At least that is the common name for the big fish. But they are far from being sharks, and we are in no danger from them."
"Oh!" exclaimed Mr. Hardley, and he seemed a little ashamed of the exhibition of fear he had manifested. "Well, they certainly seem determined to follow us," he added.
The big fish were, indeed, following the submarine, and it required no exertion on their part to maintain their speed, since below the surface the M. N. 1 could not move very fast, as indeed no submarine can, due to the resistance of the water.
"They do look as though they"d like to take a bite or two out of us,"
observed Ned. "Are they dangerous, Tom?"
"Not as a rule," was the answer. "I don"t doubt, though, but if a lone swimmer got in a school of horse mackerel he"d be badly bitten. In fact, some years ago, when there was a shark scare along the New Jersey coast, some fishermen declared that it was horse mackerel that were responsible for the death and injury of several bathers. A number of horse mackerel were caught and exhibited as sharks, but, as you can easily see, their mouths lack the under-shot arrangement of the shark, and they are not built at all as are the man-eaters."
"Bless my toothbrush!" exclaimed Mr. Damon. "Still, between a horse mackerel and a shark there isn"t much choice!"
Mr. Hardley, with a shudder, turned away from the gla.s.s windows, and Tom glanced significantly at Ned. It was another exhibition of the man"s lack of nerve.
"We"ll have trouble with him before this voyage is over," declared the young inventor to his chum, a little later.
"What makes you think so?" asked Ned.
"Because he"s yellow; that"s why. I thought him that once before, and then I revised my opinion. Now I"m back where I started. You watch--we"ll have trouble."
"Well, I guess we can handle him," observed the financial manager.
"I"m going a little deeper," announced Tom, toward evening on the first day of the voyage on the open ocean. "I want to see how she stands the pressure at five hundred feet. I feel certain she will, and even at a greater depth. But if there"s anything wrong we want to correct it before we get too far away from home. We"re going down again, deeper than before."
A little later the submarine began the descent into the lower ocean depths. From three hundred and fifty feet she went to four hundred, and when the hand on the gauge showed four hundred and fifty there was a tense moment. If anything went wrong now there would be serious trouble.
But Tom Swift and his men had done their work well. The M. N. 1 stood the strain, and when the gauge showed four hundred and ninety feet Mr.
Damon gave a faint cheer.
"Bless my apple dumpling, Tom!" he replied, "this is wonderful."
"Oh, we"ve been deeper than this," replied the young inventor, "but under different conditions. I"m glad to see how well she is standing it, though."
Suddenly, as the needle pointer on the depth gauge showed five hundred and two feet, there came a slight jar and vibration that was felt throughout the craft.
"What"s that?" suddenly and nervously cried Mr. Hardley. "Have we struck something?"
"Yes, the bottom of the ocean," answered Tom quietly. "We are now on the floor of the Atlantic, though several hundred miles, and perhaps a thousand, from the treasure ship. We b.u.mped the bottom, that"s all,"
and as he spoke he brought the submarine to a stop by a signal to the engine room.
And there, as calmly and easily as some of the ma.s.ses of seaweed growing on the ocean floor around her, rested the M. N. 1. It was a test of her powers, and well had she stood the test, though harder ones were in store for her.
And inside the submarine Tom and his party were under scarcely greater discomfort than they would have been on the surface. True, they were confined to a restricted s.p.a.ce, and the air they breathed came from compression tanks, and not from the open sky. The lights had to be kept aglow, of course, for it was pitch dark at that depth. The sunlight cannot penetrate to more than a hundred feet. But sunlight was not needed, for the craft carried powerful electric lights that could illuminate the sea in the immediate vicinity of the submarine.
"Are you going to stay here long?" asked Mr. Hardley, when Tom had spent some time making accurate readings of the various instruments of the boat. "Of course, I realize that you are the commander, but if we don"t get to the treasure ship soon some one else may loot her before we have a chance. She"s been given up as a hopeless task more than once, but the lure of the millions may attract another gang."
"I want to stay here until I make sure that nothing is leaking and that everything is all right," answered the young inventor. "This is a test I have not given her since the rebuilding. But I think she is coming through it all right, and we can soon start off again. Before we do, though, I want to try the new diving outfit. Ned, are you game for it now? This is a little deeper than you have gone out in for some time, but--"
"Oh, I"m game!" exclaimed the young financial manager. "Get out the suit, Tom, and I"ll put it on. I"ll go for a stroll on the bottom of the sea. Who knows? Perhaps I may pick up a pearl."
"Pearls aren"t found in these northern waters, any more than are sharks," said Tom with a laugh. "However, I"ll have the suits made ready. I"ll send Koku with you, and I"ll stay in this time. Mr. Damon, do you want to go out?"
"Not this time, Tom," answered the eccentric man. "My heart action isn"t what it used to be. The doctor said I mustn"t strain it. At a depth not quite so great I may take a chance."
"How about you, Mr. Hardley?" asked Tom. "Do you want to put on one of my portable diving suits and walk around on the bottom of the sea?"